Hydrochloric Acid → (S)-1-Chloro-3-(tert-butyldimethylsilyloxy)butan-2-one

A mixture of 5.00 g (21.52 mmol) of ethyl (S)-2-(tert-butyldimethylsilyloxy)propionate, 3.76 g (32.3 mmol) of sodium chloroacetate, 2.18 g (21.5 mmol) of triethylamine, and 50 mL of THF was cooled in ice, and 37 mL (64.6 mmol) of a 1.75 M solution of tert-butylmagnesium chloride was added dropwise thereto over a period of 1 hour. After the completion of the dropwise addition, reaction was performed at 0° C. for another 3 hours, and 6 M hydrochloric acid (about 20 mL) was added to the reaction solution to adjust the pH to 6.0. Subsequently, stirring was performed at 25° C. for 2 hours. A product was extracted with ethyl acetate (100 mL×2). The resulting organic layer was dried over anhydrous sodium sulfate and concentrated under reduced pressure to obtain 5.01 g of the title compound as a colorless oil (yield: 98%). 1H-NMR (400 MHz, CDCl3) δ: 0.10 (s, 6H), 0.92 (s, 9H), 1.24 (d, 3H, J=6.8 Hz), 4.35 (q, 1H, J=6.8 Hz), 5.50 (q, 2H, J=17.0 Hz).

1. temperaturewas cooled in ice
2. additionAfter the completion of the dropwise addition, reaction
3. waitwas performed at 0° C. for another 3 hours
4. waitwas performed at 25° C. for 2 hours
5. extractionA product was extracted with ethyl acetate (100 mL×2)
6. dry with materialThe resulting organic layer was dried over anhydrous sodium sulfate
7. concentrationconcentrated under reduced pressure

ORD record

ord-40159bb35b344f89bbfe85f287f3202f

Source dataset

uspto-grants-2009_09

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07582781B2